Typewriting machine



May 27 1924. 1,495,957!" A.- G. F. KURowsKl TYPEWRITING MACHINE iled nec. 6, 1919 Patented May 27, 1924. f

UNITED serres Ari-:Nr Ence ALFRED G. F. IVKUROWSKI, 0F BROOKLYN, NEW YORK, `ASSIGNOR T0 UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., ACORPORATION OF DELAWARE.

TYPEWRITING MACHINE/ Application filed` December 6, 1919. Serial '1\To.313,069.y

To all 'whom t may concer/a.' y

Be it known that I,`ALFRED Gr. F. KUROW-v SKI, a citizen of the United States, formerly a citizen of Germany, residing in Brooklyn Borough, in the county of Kings, city and,-

State of New York, have invented certain new and useful Improvements in Typewrit ing Machines, ofI which the following 1s a;

specification.

This invention relates to line-spacing -theparts in actuated position.

mechanism of typewriting machines, particularly those employing revoluble platens, in

which the line-feeding movements of they paper are apt to be uneven if the platen is i operated too quickly. An object of the invention is to provide improved means for preventing the platen from being driven lat excessive speed, and,r to protect the platen and line-spacing ymech-v anism from the effects of sudden or violent operations of theusual line-space lever on the Underwood or other machines, which lever acts both to rotate the platen and to return the platen-carriage to normal position.

A further object ofthe invention is to f make the rotation of the platen easier and return movement of theslide f f less noisy.

A feature of the invention, therefore, resides in the provision of means for yieldingly driving the platen-pawl,and, in the present improvements, this is accomplished by providing a spring, connected at one end t0 the usual line-spacing slide, the spring being directly connected at its other end to the pawl which engages and drives the platen-ratchet. The slide is also connected'to the pawl by a pin-and-slot connection where- Another feature of the invention relatesv to the provision of means for rendering the usual ratchetsdetent ineective duringA the rotation of the platen by its driving pawl. This detent is preferably thrown out of engagement with the ratchet at an early stage in the movement of the actuating' slide,A and latch'edinlineective position, provision being made for releasing the latch on .chinos of this character.

the

lof the carriage-frame and platen, sho-wing my 'improved line-spacing mechanism attached thereto.

` Figure 2 is a side elevation, with the parts in normal position. Figure 3 is'a somewhat similar view, with Figure 4` is a ldetail View of the detent pawl and latch arm.; and

Figure 5 Vis a detail view of the ratchet? actuating pawl and its supporting lever.

' In the Iusual Underwood type of machine, to which-.my invention is shown applied, the platen 1 is fixed on an aXleQ, journaled in a platen-frame, supportedl on a carriage 5. The platen is rotated by means of a bell- ,crank-lever 6 pivoted at 7, an arm 8 of ten-actuating `slide 9, having a pin 10, to

which is connected at one end a spring 11, the other end of the spring being connected to a pin 12, projecting from the face of a pawl13, pivoted vatlt on a pawl-carrying lever 1.5, saidi lever being mounted for pivotal movement on the platen-axle. Fixed to saidaXle is the usual platen-ratchet 16, and the-pawl 13 is provided with a nose 17, for engaging land moving they platennratchet when the slide 9 is actuated.` Normally, the parts are inthe position shown in Figure 2,

the sfpring 11 tending to-.rock the pawl on its pivotll, but Vbeing preventedfrom so doing by a pin 1 8 projecting from the face of the pawl 13, saidpin resting' upon a shelf 19,

carried by gage 20, the gage being adjustable to vary the line-spacing, as is usual in ma- When the bellcrank-lever 6l is 'operated -and the slide 9 moved rearwardly,the tension on the spring 11 is increased, and the pawl is permitted to move forward under its action, by reason of a slot in the slide, into which the pivot 14 of thepawlprojects. Just a's'soon as the pin 18 moves off of thek shelf19, the pawl is rocked Zon its pivot and engages theteeth'of the ratchet, further' movement ofthe pawl driv ing the ratchet. The slide 9 is returned to normal position by a spring 2l, which may also be connected at one end to the pin l() ;1 said spring at its other end being connected to a pin 22, projecting from an end plate of the platen-iframe. -As the-,slide is ireturned,

'A spring A26, coiledy about' tlie/pivotjfen- `gages the arm y24, and tendslto-no nalfly maintain the f detent in engagement fv'fi'th` the ratchetfteeth. This pavvlillever also ilrovided with" an arm, 27,'1having-' acaml'face 28 at its outerendgwhich cam-''facelisadapted to be engaged by a' pin 29,' carriedfby v the slide 9, said pin acting to depress zthefjaim '27, to thereby move the'detent-roller 25 out of engagement 'with the 'ratchetfteethvrThis action occurs during fthe -initial driving movement of fthe yslide f5), and priorfto the time that fthev nose ot 't-he pavvl beginsllto drive the ratchet. `lInv o'rderitov m'aintainvthe detentroll'er in ineffective positiongvduring the drivingaction of thepavvl,v Ya"ledge130 is provided Yon they arm27, and1 ai '1a.tch31, urged by a spring 32, lisl m'ove'dfby said spring into engagementfyvithsaidledge the latchy 8l being Apijvotd' ong a bracketi/Blwon the platen-trame. or1nally,1however, this movement is prevented by reason of the'p'in 29 engag'inglthe end of the latch, as Ash'oftvn in Figure '2. As' the slide advances" in 'its operation, however', the lpin 29"lyeaves the' end of the latch 'and p'ermits'the sprin'g`32ito of said elementf'ivhile said element isf moved move the latch, to permit its''shoulder' to 'engage over the ledge 30, to"holdthe"` arm 27 in the depressed'(positionto vvvhifch;it'flffas been moved by the pini29f. Thearm27iis cut away along .its `top-portion, so th'atfno drag; is offered tc the slide 9fasthejs'an'ie advances. and also "as Vit returns? to normal position. On the freturning'j the slide, however, .thepin 29;' C, V end of' the latch 31', and releases they arm 27, the :spring 26 immediately actingtdr'e- 'engage the detent-'roller25 'tv'it'h the het. "'Overthroiv of 'the platen, duriiigtliedriv'ing action 'of the "plaivl," mayibeipreventted iby providing" a ibldck" fastened tot the end j 'plate 'of *the icarrageifraniegthis "xpavvl 'when said slidefis returned.

bination withua rotatable platen, of linespacing mechanism, including a ratchet, a lever .pivoted cro-axially therewith, Vapawl `pivoted on said lever, aslide,-.and a spring connected to said slide, and so'connected to saidpaivl that when said slide is moved,

said spring acts to rock said pawl on its pivot? into contact- With said ratchet and to move said lever and pawl to ratchet. Y t '12. In '1a typewriting "machineythecomactuate said binat'ion with -a rotatable platen,- of line- "Spacin'g "mechanism, includingfa pavvhfto rotate" fthe platen; a slide, aspring"connected 1 yto said'jpawl and slide,l *toL actua-te ',saidf pawl cnf-'movement of said s1 de,2.= and: alpin-andslot connection? between' said ipa'ivl and slide, to enablev said slide to positivel'yfreturn'said In a 'type'writing'machine, .th l combination with a' rotatable ,p1/aten, of' lfinelsplacing mechanism, iiieludin'g a"`rat'chet operatively vconnected"to said plateina pawl'i'jitoactuate said ratchet, a slideia*springt connectjedito t.means on 'said' paivl to'guide thefsameinto action. A vi-t. "ln a typeivritingimachine, the combination Withfa rotatableplaten,A of'arat'cliet therefor, a detent-pawl normally engaging "said ratchet, means'to lrotate said" ratchet,

4`an element, eftectiiie on the actuation otsaid rotating means, to move said Adetentfpawl out ot"y ei'igagement' with -said ratchet, and means for vviixsitively lriclingv said detentpaivl in said position andfor'holding itclear back and forth with lthe rotating means durinfe" operation said rotating; Imeans.

:5. vIn ai typeivritingl,f machine,'thecombina-E tion ivith a 'rotatable platen, fot afratcliet therefor, a detent-paivl normallyjengaging 'said ratchet; an' actu ating slide, element, brought into l Yaction on 'movement "of vsaid slide, to; l'm'oveffsaid' cfle'tent-palivl out ot'Y e'n-KI gapiemefnt "ivi'th said '"iatchet, and tomove sai-d ratchet and j'm'eans to hold'f said detent-y jfpavvlf'out ot'engagement'ivithsai'd e'l'e'inent tof avoid an idledreef of 'saidlel'einentffon said de'tentlpawl AWhile `the '-fslide is fbeingy actuated.

' "6. al type'Writing'machine,V the combination" with a 'retatable'fplaten, l of a 'fratchet thereicr, a' detentlpawl normally engaging said ratchet, @said 'ide ,antipasti aan u.

A arm provided with ya 'cam-face, "an actuating slide.,l means, brought into action on movement of said slide, for rotating said ratchet,r

an element carried by said slide -for engagement witli'the cam-face of said arm to rock'A said detent-pawl to disengage the same from said ratchet prior to the rotation thereof,

and -a locking pawl rendered effective after the initial movement of said slide to hold the arm out of engagement with said element while the slide is operating.

7. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, a detent-pawl normally engaging said ratchet, a pawl for rotating said ratchet, normally out of engagement therewith, an actuating slide, means, effective on movement of said slide, for moving said pawl into engagement with said ratchet to rotate said ratchet, means brought into action on the initial movement of said slide and prior to the rotating movement of said pawl for actuating said detent-pawl to move it out of engagement with said ratchet, and means for holding said detent-pawl out of engagement with its actuating means after the initial movement of the slide.

8. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, a detent-pawl normally engaging said ratchet, said detent-pawl having an arm provided with a cam-face, an actuating slide, throw-out means, brought into action on the initial movement of said slide, for moving said detent-pawl out of engagement with said ratchet and for latching said detent'- pawl in said position to hold the detentpawl clear of the throw-out means after the initial movement of said slide, and means,

also brought into action by said slide, for subsequently rotating said ratchet.

9. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, a detent-pawl normally engaging said ratchet, a reciprocating slide, throwout means, brought into action on the initial movement of said slide in one direction, to release said detent-pawl, a latch to hold the detent-pawl released and clear of the throwout means during the subsequent movement of said slide, and means, brought into action on movement of said slide in the other direction, to release the latch.

l0. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, ade'tent-pawl normally engaging said ratchet, a reciprocating slide, throwout means, brought into action on movement of said slide in one direction, to release said detent-pawl, means to latch said detent-pawl in released position and hold it clear of the throw-out means, and means, brought into actionl on movement of said slide in the other drectcn, te release said latchiag means.

lili la a typewriting' machine, the @ma bination 'with arotatable platen, of` a ratchet therefor, a detent-pawl normally |engaging Said ratchet, said detent-pawl having an arm provided with a cam-face, an actuating slide, a pawl to actuate said ratchet, a pinr onv said slide to engage1 said cam-face tomove said detent-pawl to released position prior to the actuation of said ratchet by said pawl, and a latch to hold said detent-pawl released, said pin being arranged to engage said latch, to release said detent-pawl on return movement of said slide.

l2. In a typewriting machine, the combination with a rotatable platen, of a detent acting on said platen to resist turning of the platen, a line-spacing handle, yielding operating connections between the handle and the platen for yieldingly turning the platen, and means operated by the handle, independently of said yielding connections, for rendering the detent ineffective during line- Spacing operations, and thereby making it unnecessary for the yielding platen-turning connections to overcome the resistance of the detent.

13. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, a `pawl for actuating said ratchet, and operating means for said pawl, resiliently connected thereto, to move said pawl in one direction to resiliently actuate said ratchet, and positively connected 'to said pawl to return the same to normal position.

14. In a typewriting machine, the com-l bination with a rotatable platen, of a ratchet therefor, a pawl for actuating said ratchet, operating means for said pawl, a spring connecting said operating means and pawl to actuate the pawl, and thereby yieldingly actuate the ratchet, and a spring forreturning said operating means and pawl to normal position.

15. In a typewriting machine, the combination with a rotatable platen, of a ratchet therefor, a pawl for actuatingsaid ratchet, operating means for said pawl, a spring connecting said operatingimeans and pawl, ar lost-motion connection between said operating means and pawl, and a spring forreturning said operating means to normal position, said returning spring acting through said lost-motion connection to also return said pawl to normal position.

16. In a typewriting machine, a rotatable platen, a detent normally acting on the platen to yieldingly resist turning thereof, line-spacing mechanism for feeding the platen, means for rendering the detent ineffective during line-spacing operations, and means for preventing overfeeding of the platen when said detent is ineffective.

17. In a typewriting machine, the combination of a platen, a platen shaft, a ratchet Wheel secured .te said platen shaft, a sup porting arm pvoted en said theft, a pawl te lil@ maew

engage the ratchet Wheel, sadpaWLbeng of said slideto movejhegpawlzand itssupv pvoted onjsad arm, im ae'uatrylgl sldeand l porting arm abouty the `plat-,er1` shaft to,;actu 10 .a spring connecting saidv paWl with vSaid ate ythevratehet Wheelenol` consequently roslde, seid spring being efeetvefon the ntaie theplaten. Y

5 tal movement of said slide to swing the v l ALFRED G. FVKURWSKI.

ipewl about its pvot tobrng -t into eng-yge- Wltnesses: Y v ment with the ,ratchet Wheel, .said spring JENNIE P.,;TH0RNE,

.being eifectve on the subsequent movement :ED1TH='B.,LIBBEY. 

